Abstract
Thermally induced migration of Li+-cations from the interlamellar region into the sheet structure of montmorillonite clays has long been known to lead to charge reduction which, depending on conditions, may be partial or virtually complete. Charge regeneration by treatment with strong base involves H+-extraction from the sheets and detailed structural and interlamellar analysis establishes a 1∶1 balance between Li+ and H+ arising from the structural exchange -OH + Li+→-OLi + H+. Such lithiated clays are substantially more thermally and solvent stable than their precursors.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R. Greene-Kelly, Clay Min. Bull., 2 (1953) 52.
R. Calvet and R. Prost, Clays and Clay Min., 19 (1971) 175.
J.D. Russel and V.G. Farmer, Clay Min. Bull, 5 (1964) 443.
G. Ertem, Clays and Clay Min., 20 (1972) 199.
J.H. Purnell, J.M. Thomas, P. Diddams, J.A. Ballantine and W. Jones, Catal. Lett. 2 (1989) 125.
J.A. Ballantine, J.H. Purnell, M. Rayanakorn, J.M. Thomas and K.J. Williams, J. Chem. Soc. Chem. Comm. (1981) 9.
J.A. Ballantine, P. Graham, Iia Patel, J.H. Purnell, K.J. Williams and J.M. Thomas,Proc. Int. Clay Conf., Denver, 1985, eds. L.G. Schultz, H. van Olphen and F.A. Mumpton (The Clay Minerals Society, Bloomington, Indiana, 1987) p. 311.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Williams, J., Purnell, J.H. & Ballantine, J.A. The mechanism of layer charge reduction and regeneration in Li+-exchanged montmorillonite. Catal Lett 9, 115–119 (1991). https://doi.org/10.1007/BF00769089
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00769089